JP2000348685A - Tungsten halogen lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a glass crack and a leak from being produced. SOLUTION: This tungsten halogen lamp is equipped with a bulb 1 having a crushedly sealed part 2 at its end part. A filament 3 is provided in the bulb 1, and designated halogen is sealed in it. This filament 3 is connected to and supported by internal lead-in wires 4, 5. A supporting member 6 has an external shape parallel to the inner surface of the bulb 1, and keeps a slight gap from the inner surface of the bulb 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to home use, store use,
The present invention relates to a halogen bulb used for studio lighting or the like.

[0002]

2. Description of the Related Art As shown in FIG. 3, a conventional halogen bulb, for example, a one-end sealed type halogen bulb, has a glass bulb having a filament 3 inside and a crushable sealing section 2 at an end. 1 is fixed in a base 9 by an insulating adhesive 10. The filaments 3 are supported with internal introduction wires 4 and 5 connected to both ends thereof. As shown in FIG. 4, the internal introduction lines 4 and 5 are 7 mm × 20 mm ×
While being supported by a 6 mm rectangular parallelepiped glass rod 12, it is connected to one end of an external introduction wire 8 via an introduction foil 7 made of molybdenum. The external introduction wire 8 is inserted into a base lead-out portion 11 provided on the outer bottom surface of the base 9 and fixed by plasma welding or the like.

[0003]

In such a conventional device, when the temperature of the crushed sealing portion 2 exceeds 350 ° C., the external introduction line 8 made of molybdenum is oxidized. From the crushed sealing portion 2 to the inside of the crushed sealing portion 2, and the convex oxide grown on the surface of the external introduction wire 8 gives stress to the crushed sealing portion 2, There is a problem that cracks occur in the sealing portion 2.

In addition, oxidation of the surface of the external introduction wire 8 proceeds, and oxidation also proceeds on the surface of the introduction foil 7.
Oxidation reaches the internal introduction lines 4 and 5 to cause leakage.

The present invention has been made in order to solve such a problem, and it is an object of the present invention to provide a long-life halogen bulb in which glass cracks and leaks are prevented from occurring.

[0006]

SUMMARY OF THE INVENTION A halogen bulb according to the present invention comprises a bulb having a crushable seal at an end, a plurality of internal lead wires, and a filament fixed to the end of the internal lead wire. A supporting member provided on the internal introduction line, and a sealing gas, wherein the supporting member has an outer shape along an inner surface of the valve, and has a slight gap with respect to the inner surface of the valve. Configuration.

With this configuration, it is possible to suppress an increase in the temperature of the crushed sealing portion due to convection and heat conduction of the high-temperature sealed gas in the valve.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a one-end sealed halogen lamp having a rated voltage of 100 V, an output of 2,000 W, and an efficiency of 29 lm / W according to an embodiment of the present invention, as shown in FIG. Spheroidal bulging portion 1b, a cylindrical body portion 1c having an inner diameter of 22.0 mm, and a crush sealing portion 2 are sequentially provided with a glass bulb 1. A filament 3 made of tungsten is provided in the bulb 1. The filament 3 is connected and supported at both ends by internal introduction wires 4 and 5 having a diameter of 1.5 mm. The support member 6 is formed of a translucent glass rod having an outer shape along the inner surface of the bulb 1 (the inner surface of the body 1c), that is, a disk-shaped glass rod. As shown in FIG. 2, the support member 6 is formed by pressing a semi-disc glass plate having an outer diameter of 20.0 mm and a thickness of 5.5 mm from both directions into a disc shape. As shown in FIG. 1, one end of each of the internal introduction wires 4 and 5 is connected to an external introduction wire 8 (one is not shown) via an introduction foil 7 (one is not shown) sealed in the crush sealing portion 2. , Not shown). The other end of the external introduction wire 8 is led out of the crushable sealing portion 2. The crushed sealing portion 2 is inserted into a base 9 made of ceramic, and is fixed by an insulating adhesive 10 injected into the base 9. The other end of the external introduction wire 8 is inserted into a base lead-out portion 11 provided on the outer bottom surface of the base 9, and is fixed by plasma welding or the like.

A predetermined halogen and argon gas are sealed in the bulb 1.

Next, the operation and effect of such a halogen bulb (hereinafter, referred to as the present invention) will be described.

The present invention and a halogen bulb (hereinafter referred to as a conventional product) having the same configuration as that of the present invention except that a rectangular parallelepiped support member as shown in FIG. 4 is used. The measurement of the temperature of the crushed sealing portion and the life test were performed, and the following results were obtained. However, the temperature of the crushed sealing portion was measured using a thermocouple K line of 0.2 mm (diameter) and conformed to JIS C7527 “Method for measuring temperature of sealed portion of halogen bulb”.

In the product of the present invention, the temperature of the crushed sealing portion during stable lighting is 350 ° C., and after 200 hours of lighting,
Although the surfaces of the introduction foil 7 and the external introduction wire 8 were partially discolored to black, no glass crack occurred in the crushed sealing portion 2 and the lamp was turned on until the end of life. On the other hand, in the conventional product, the temperature of the crushed sealing portion at the time of stable lighting becomes 380 ° C., and after lighting for 135 hours, 90% of the surface of the introduction foil or the external introduction wire turns black and oxidizes, and the crushing sealing is performed. A glass crack occurred in the portion, and the portion became unlit.

As described above, the temperature of the crushed sealing portion in the product of the present invention is lower than that of the conventional product because there is almost no gap between the inner surface of the body portion 1c and the side surface of the support member 6, Part 1b
This is considered to be because it is possible to prevent the sealed gas having a high temperature inside from being transmitted to the vicinity of the crushed sealing portion by convection, diffusion, and the like.

As described above, according to the structure of the present invention, the high-temperature sealing gas in the bulging portion 1b can be prevented from reaching the vicinity of the crushed sealing portion due to convection, diffusion, and the like. The rise in the temperature of the stop portion can be suppressed, and the occurrence of glass cracks and leaks can be prevented.

Further, since the support member 6 is made of a translucent glass rod, even if the halogen bulb of the present invention is used in combination with a reflector, the light generated in the filament is sufficiently radiated also in the direction of the base. It is possible to prevent the reflection efficiency of the reflecting mirror from being reduced.

Next, the inner surface of the valve 1, that is, the body 1c
L (mm) between the support member 6 and the side surface of the support member 6 (see FIG. 2)
Is preferably 0 <L ≦ 1.0.

This is because, when L> 1.0, the action of preventing the high-temperature sealed gas from reaching the crushed sealing portion becomes insufficient, and the external introduction wire and the introduced foil are oxidized, and the crushing sealing is performed. This is because glass cracks and leaks occur in the part, and the light is turned off before the end of the life. Also, when L = 0, the support member cannot be inserted into the valve because the valve comes into contact with the support member.

[0018]

As described above, the present invention can prevent the high-temperature sealed gas from reaching the vicinity of the crushed sealing portion by convection and diffusion. An object of the present invention is to provide a long-life halogen bulb that can suppress the occurrence of glass cracks and leaks in the crushed sealing portion.

[Brief description of the drawings]

FIG. 1 shows a rated voltage of 100 according to an embodiment of the present invention.
V, output 2000 W, efficiency 29 lm / W, partially cut-away front view of one end sealed halogen bulb

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a partially cutaway front view of a conventional one-end sealed halogen bulb.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Glass bulb 2 Crush sealing part 3 Filament 4,5 Internal introduction line 6 Support member

Claims (3)

[Claims] 1. A valve having a crush seal at an end,
A plurality of internal introduction lines, a filament fixed to an end of the internal introduction line, a support member provided on the internal introduction line, and a sealing gas, wherein the support member has an inner surface of the valve. Characterized in that the bulb has an outer shape along with a slight gap with respect to the inner surface of the bulb. 2. The halogen lamp according to claim 1, wherein, when a gap between the inner surface of the bulb and the support member is L (mm), 0 <L ≦ 1.0 is satisfied. 3. The halogen lamp according to claim 1, wherein said support member is disk-shaped.